The King of CodeIgniter .htaccess'

<IfModule mod_rewrite.c>

	Options +FollowSymLinks
	RewriteEngine on

	# NOTICE: If you get a 404 play with combinations of the following commented out lines
	#AllowOverride All
	#RewriteBase /wherever/ci/is

	# Keep people out of codeigniter directory and Git/Mercurial data
	RedirectMatch 403 ^/(application\/cache|codeigniter|\.git|\.hg).*$

	# Send request via index.php (again, not if its a real file or folder)
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteCond %{REQUEST_FILENAME} !-d

	<IfModule mod_php5.c>
		RewriteRule ^(.*)$ index.php/$1 [L]
	</IfModule>

	<IfModule !mod_php5.c>
		RewriteRule ^(.*)$ index.php?/$1 [L]
	</IfModule>

</IfModule>

What about hiding .svn folders as well? ;)

Huh, .svn? What is this crazy old tech you speak of?

I avoided that as it would need another rule, .svn could be any damn place within the web directory, not just at the root level.

If that's how you feel about svn, then enjoy this:

RewriteRule ^.svn/(.*)$ http://git-scm.com/ [R]